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Integrated pest management across spatial scales

Riggi, Laura (2017). Integrated pest management across spatial scales. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2017:28
ISBN 978-91-576-8829-3
eISBN 978-91-576-8830-9
[Doctoral thesis]

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Despite spectacular increases in agricultural productivity per unit of land and labour and a continually growing awareness of the importance of sustainable agriculture, modern agriculture faces serious problems at scales ranging from individual fields to regions. Such problems include increased resistance of pests to pesticides, loss of soil fertility, and loss of diversified habitats in the landscape. In my thesis I aim to better understand how field and landscape scale management affects integrated pest management with a particular focus on pest abundance, pest resistance, and biological pest control by naturally occurring enemies.

Using large scale landscape field studies, we investigated the effect of landscape composition on pollen beetle pesticide resistance and abundance, and on abundance of its natural enemies in oilseed rape (Papers I and II). We found that the amount of oilseed rape crop in the landscape increased pest abundance and pesticide resistance in the target pest. Negative effects of landscape intensity were found on specialist but not on generalist natural enemies. This suggests that generalist predator communities are well adapted to crop-dominated landscapes. Therefore, management of natural pest control services by generalist predators in oilseed rape in Sweden should prioritize local scale management practices.

At the local scale, we investigated the impact of four major herbivores on oilseed rape yield. We found that under specific combinations of pests, attacks by several different pests have a positive effect on oilseed rape yield (Paper III). Increasing our knowledge about multiple pest–plant interactions has a potential for directly increasing yield while reducing pesticide input.

Finally, we tested how local scale long-term fertilisation affects soil communities and natural pest control (Papers IV and V). Our results suggest that in intensively managed agricultural systems, biennial organic fertilisation is insufficient to promote diversity within the soil community in the long-term. Generalist predators, however, benefitted from high quality organic fertilisation in the long-term, which in turn exerted top-down control on the aphid pest.

Authors/Creators:Riggi, Laura
Title:Integrated pest management across spatial scales
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2017
Depositing date:2017
Number of Pages:55
IRiggi LG, Gagic V, Bommarco R & Ekbom B (2015). Insecticide resistance in pollen beetles over 7 years - a landscape approach. Pest Management Science (72), 780–786
IIRiggi LG, Gagic V, Rusch A, Malsher G, Ekbom B & Bommarco R. Pollen beetle mortality is increased by ground-dwelling generalist predators and soil clay content, but not landscape complexity (manuscript).
IIIGagic V, Riggi LG, Ekbom B, Malsher G, Rusch A & Bommarco R (2016). Interactive effects of pests increase seed yield. Ecology and Evolution (6), 2149–2157.
IVRiggi LG, Taylor A, Viketoft M, Hallin S & Bommarco R. Long-term organic and mineral fertilisation affects soil communities composition and associations (manuscript)
VRiggi LG & Bommarco R. Subsidy quality mediates the direction of trophic cascades in an agroecosystem (manuscript).
Place of Publication:Uppsala
Publisher:Department of Ecology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8829-3
ISBN for electronic version:978-91-576-8830-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:H Protection of plants and stored products > H10 Pests of plants
P Natural resources > P01 Nature conservation and land resources
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Agrovoc terms:biological control, pesticid resistance, organic fertilizers, inorganic fertilizers, pest insects, predators, pest management, agroecosystems, natural enemies, biodiversity
Keywords:biological control, pesticide resistance, landscape ecology, organic and mineral fertilisation
Permanent URL:
ID Code:14226
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
External funders:FORMAS
Deposited By: miss LGA Riggi
Deposited On:06 Apr 2017 08:16
Metadata Last Modified:09 Sep 2020 14:17

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